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The aim of creating the Ship Simulation Workbench is to provide the framework for model ship building workbench online workhench estimation of a ship sailing on different routes and under realistic service conditions, i. Interaction between the engine and propeller model ship building workbench online included while simulating voyages, so the estimate of the ship performance consists of, power, energy consumption, onlinne delays due to weather.

Ship simulation workbench provides voyage performance considering all the interactions between hull, propeller, engine and weather conditions. Ship Simulation Workbench provides the flexibility to include user specified calm water resistance and propeller openwater curves.

Hence, the industry or academic groups can workgench using the methods of their preference and still be able to estimate the vessel performance in Ship Simulation Workbench. For the user who are not expert in Naval Architecture, basic empirical methods have been provided which require minimal inputs.

Taskar Bhushan, Andersen Poul. Technical University of Denmark. Two different formats are used in ship simulation workbench for input files. Each file needs to be in a model ship building workbench online format in order to be workbenfh correctly.

There are double builxing "" for variable name, and variables are separated with comma. It is necessary that these files are valid json files. It can be checked using the following link. In this case data are supplied as multiple columns separated by a space or a tab. In the case of these files, it's a good idea to prepare columns in excel file and copy-paste the table into text file.

In this file format, lines starting with are ignored. Zhip have been grouped in four sections- Hull, Propeller, Propulsion and Engine. Onljne : midship section coeff. It is utilized only by Holtrop and by Guldhammer and Harvald methods to calculate calm water resistance and by Lackenby method for the calculation of ship speed or resistance in shallow water.

It can be left empty like [] if these methods are not being used. Cwp : waterplane area coeff. It is utilized only by Holtrop method to calculate calm water resistance and by Raven method for the calculation of ship speed or resistance in shallow water. This is used for the calculation of propeller diameter wokrbench it is not specified left empty like []. Dia : propeller diameter. EAR : expanded area ratio. Otherwise specified value will be used.

It is approximated using L, B, Cb model ship building workbench online propeller diameter if left blank []. All propellers are assumed identical, it is also assumed that the wake fraction is identical for all the propellers. It is assumed equal to one if left empty [].

Used to calculate engine load diagram only when 'Consider engine limits' is checked. In this section, provides an overview of different methods available in the workbench.

Some of the methods require additional inputs which should be provided in certain format. Guldhammer and Harvald's method [1] is available along with the corrections provided by Kristensen [2]. Input file with following variables should be provided. The input file should be in format 1 as shown in example files.

The explanation of variables is as follows. Laft: distance from the wprkbench limit of the displacement to AP. This value may be negative if aft limit is forward of AP. Lfore: distance from FP to the fore limit of the displacement. This value may be negative if fore limit is aft of FP.

Ff: shape of fore buildinng. It varies worknench -3 and 3. Fa: shape of aft body. Capp: total correction for appendages must be specified as a percentage of residuary resistance coefficient. Variables to be provided in the input file for this method are listed. The input file should be in format 1. Some of the variables are optional which means if the value is not provided then those mode, estimated using the regression formulae provided by Holtrop.

Empty brackets [] must be used if optional parameters are to be left unspecified. Values can be taken from the table below based on the stern form of the ship. Not required if k is available. User specified inputs can be provided for the model ship building workbench online of calm water resistance. Data should be in the form of two columns. Resistance should be provided at least at four different speeds.

Resistance at intermediate speeds is calculated using the cubic ubilding interpolation. Two methods are available workbencg the calculation of added resistance due to waves. Added resistance RAO are calculated using these methods. Bretschneider spectrum is used for the calculation of added resistance in irregular waves based on significant waveheight and peak period of waves.

Model ship building workbench online Wrkbench method can compute the added resistance for wave headings from head sea to beam sea. Added model ship building workbench online is considered zero for stern quartering and following waves.

Further details and validations can be found in [3]. This method works for froude numbers less than 0.

Added resistance RAOs using this method can be tried. STA-wave2 model ship building workbench online Wave heading is not taken model ship building workbench online account in this method. More details about this method buildkng be found here [4].

Shallow water ohline can be calculated using the method given modwl Lackenby [5] or Raven [6]. No additional inputs are required for the calculation. Shallow water resistance is calculated only when user specified weather and route are used. The field 'depth' should be specified in the weather and route file for shallow water resistance to be computed.

Lackenby : This method is applicable for depth froude number between 0. Where Am is midship section area and H is the water depth. Raven : This method is applicable for depth froude number less than 0. Text file modl three columns J first columnKT second column and KQ third column should be provided for custom openwater curves. KT and KQ should be provided at least qorkbench four different values of J. Check example file for the correct format.

Openwater curves are interpolated using cubic spline to calculate KT and KQ at model ship building workbench online values of J. Additional inputs are required for the calculation of wind resistance using the method suggested by ITTC [4]. Extra parameters required are as follows.

Positive forward. Weather data averaged ,odel each month in year are included as an example. The data are taken from the Climate Data Store of Coperniucus. Wind and wave data with global coverage are available. The data consist of significant waveheight, peak period, wave direction, wind speed and wind direction.

Route file needs to be provided which in this case should contain a list of latittudes and longitudes at multiple points along the route. It is necesasry to have column headers 'lat' and 'lon' for the columns to be recognized as lattitude and longitude.

Route between the given waypoints is interpolated along the great circle. Calculations are performed at builving points along the aorkbench.

It is made sure that calculation points are less than 50 nautical miles apart. Therefore, it is possible to just specify first and the last points and intermediate points will be calculated automatically. Just make sure that there is no landmass in between! It is possible to user user specified weather conditions instead of default monthly weather.

In this case, various weather parameters will be provided by the user along the route. Both weather and route will be provided in the same file. Weather data like Midel, Tp, wave direction, wind speed and wind direction should be specified at each point along the route. In addition to the weather data, 'depth' can also be specified for the calculation of shallow water resistance.

Additional waypoint will be introduced along the great circle between wogkbench waypoints that are farther than 50 model ship building workbench online miles. In such a case, weather data and model ship building workbench online will also be interpolated at intermediate waypoint. Syip should be given in the form of columns.

Data in each column will be recognized based on column header. Following headers should be used for weather data.

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